I work full time. I also have a side business & pay estimated income on that. IRS calculator asks about other income. Do I include side business income when updating w4?

[sdfalconer]

I am updating my full time job W4.  It feels redundant to include side business income when recalculating W4 when I already pay estimated income tax on the side business income.

[Critter]

You do not need to do so if you are taking care of the side business income separately .... however you could have enough withheld from the paycheck to cover the side income if you would like.